Capital and Accumulated Other Comprehensive (Loss) Income Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 24, 2013	Jan. 02, 2012
Class of Stock [Line Items]
Vesting percentage			33.33%
Common units outstanding (in shares)	27,355,527		27,355,527		27,566,200
Units issued and vesting of restricted units			$ 3,091
Vesting period (in years)			3 years
Incentive units granted, percentage of outstanding common units (as a percent)							100.00%
Unit option plan expense	$ 6,353	$ 544	$ 1,040	$ 0
Class A
Class of Stock [Line Items]
Common units outstanding (in shares)	27,225,263		27,225,263
Class B
Class of Stock [Line Items]
Common units outstanding (in shares)	130,264		130,264
Common Units
Class of Stock [Line Items]
Authorized amount						$ 5,000
Treasury stock (in shares)	262,073		262,073
Treasury stock repurchased			$ 4,488
Common Unit
Class of Stock [Line Items]
Units repurchased during the period (shares)	249,632
Units repurchased during the period	$ 4,458
Director | Steel Partners II, L.P. | Restricted Common Units
Class of Stock [Line Items]
Units issued and vesting of restricted units			75
Director | Steel Partners II, L.P. | Common Unit
Class of Stock [Line Items]
Stock issued net of forfeitures			760
Common units issuance expense	$ 104	$ 104	198	$ 198
SP General Services LLC | Related Party Debt
Class of Stock [Line Items]
Shares issued			$ 1,800